Liquid fuel



. in the amount of agent required.

Patented Ma 6, 1930 UNITED. STATES CARL o. JOHNS, or ELIZABETH, NEWJERSEY, nssr'enon TO STANDARD OIL DEVELOP- PATENT OFFICE KENT COMPANY, ACORPORATION OF DELAWARE I LIQUID FUEL No Drawing.

This invention relates to motor fuels, and particularly motor fuelswhich it is desired shall be operable under relatively high "en'- thiscondition it has been proposed to add to such fuels a metallo-alkylcompound, particularly lead tetraethyl. While effective in reducing theknocking propensities of the fuel, objection is made in some instancesto the presence of as much lead as is involved In accordance with thepresent-invention. the amount of lead or other metallo-alkyl compoundnecessary to accomplish the desired object can be minimized, it beingfound that in adding lead tetraethyl to gasoline for instance, theknocking propensity of the gasoline is reduced not in direct proportionwith increasing increments of added lead tetraethyl but the first cubiccentimeter of lead compound for instance per gallon of gasoline is themost effective While the result of additional increments of theanti-knock agent is successively less. In preparing a motor fuel, Iemploy a small amount of lead tetraethyl sufiicient in quantity toproduce the first and greatest efiect but instead of addin furtherincrements of lead tetraethyl to equal the total'proportion of the agentheretofore customarily used, I further modify the petroleumhydrocarbons-by the addition Application filed May 21,

1924. Serial No. 714,810.

.the quantity'of anti-knock agent needed in a gasoline to produce afuelthat may be used without detonation in internal combustion engineshaving relatively high compressions.

.I claim: I

1. A motor fuel which comprises a mixture of about 95% of gasoline and5% of ethyl alcohol, and lead tetraethyl in the amount of about 1 cc.per gallon of the mixture. 2. A motor fuel which comprises a mixture of90-97% of gasoline and 23-10% of an alcohol with a boiling point withinthe gas-- oline range, and lead tetraethyl in the amount of 12 cc. pergallon of the mixture. 3. A motor fuel which comprises a mixture ofgasoline with not to exceed 10% of an I alcohol with a boiling pointwithin the gasoline range, and lead" tetraethyl in amount not to exceed2 cc. per gallon of the mixture.

4. A motor fuel which comprises a mixture of petroleum hydrocarbons witha relatively small proportion of analcohol'boiling with in the range ofsaid petroleum hydrocarbons, and lead tetraethyl inamount not to exceed1 2 cc. per gallon of the mixture. g a 5. A motor fuel which comprisespetroleum hydrocarbons, an alcohol boiling within the range of saidhydrocarbons in relatively small proportion, knock agent.

4 CARL O. JOHNS.

of a small proportion ,of an alcohol; as for example ethyl alcohol,methyl alcohol, or

isopropyl alcohol or mixtures thereof. The

alcohol may be added in amount of 13-10% position comprises a mixtureofabout 9 5% v of gasoline and 5% of ethyl alcohol, and-1V cc.,of leadtetraethyl per gallon-of the mixture'. By using-my preferred type ofmodified fuel, I am able to materially decrease and a metallo-alkylanti- A iou

